To provide a system which can improve a steadily gazing capability as an effect of learning by enabling an observer to recognize the observer's steadily gazing capability by himself or herself in calibration and enables the observer to safely use the system.

The system has a means for detecting a line-of-sight of the observer, a calibration means for calculating a correction value for correcting the line-of-sight position calculated by the means for detecting the line-of-sight, a means for collecting the distribution of line-of-sight points for obtaining information on a plurality of line-of-sight positions when the observer gazes the same one point, and a display means. The means for collecting the distribution of the line-of-sight points is also implemented simultaneously with the implementation of the calibration means and the degree of the variation in the distribution of the line-of-sight points is displayed on the display means in accordance with the output of the means for collecting the distribution of the line-of-sight points.